Viking Self-Amplified Paging System Control IR Remote - SA-25

Viking Electronics SA-25 Self-Amplified Paging System Controller

The Viking Electronics SA-25 is a dedicated controller for self-amplified paging speaker networks, able to directly drive up to 25 Viking SA-1S or SA-1H two-wire self-amplified ceiling speakers from a single unit — no separate amplifier rack, no complex wiring topology. If you're deploying overhead paging in a school, clinic, light-industrial facility, or office building and want a clean two-wire run rather than a traditional 70V distributed audio plant, the SA-25 (often searched as SA 25) is the controller this system is built around.

Key Features

• Up to 25 Self-Amplified Speakers on One Controller: The SA-25 drives up to 25 Viking SA-1S or SA-1H speakers directly over a Viking 40V two-wire bus. Each speaker carries its own amplifier, so the controller only needs to deliver talk battery and audio — dramatically simplifying homerun wiring versus a central amp feeding passive speakers. For a 20-zone floor, one SA-25 handles the entire speaker count without additional hardware.
• Dual Paging Output Standards: The SA-25 supports both Viking's 40V two-wire format and the industry-standard Valcom/Bogen 24V four-wire format. That dual compatibility means you can integrate into existing Valcom or Bogen paging infrastructure or deploy Viking's own SA-1S speaker ecosystem — the same controller serves both architectures, which matters when you're retrofitting a building that already has a partial Valcom installation.
• 40V DC Talk Battery at 30mA Nominal: The 40V DC talk battery output at 30mA nominal powers each speaker's amplifier circuit over the two-wire loop. Understanding the current budget matters: at 30mA nominal per loop, plan your wire gauge and run length using the chart in the product manual (page 3) to avoid voltage drop that would degrade audio quality at the far end of long runs.
• 3.5mm Audio Input Jack: The 3.5mm (1/8-inch) audio input jack accepts a standard analog audio source — useful for connecting a phone system's paging port, an intercom master, or a standalone mic preamp. No proprietary input connector to source.
• 2.1mm Barrel Jack and 20 Cage-Clamp Screw Terminals: The 2.1mm barrel jack handles power input cleanly, while 20 cage-clamp screw terminals provide secure, vibration-resistant field terminations for speaker loop wiring, paging source, and control lines. Cage-clamp terminals are faster to land than traditional screw-capture terminals and won't loosen under building vibration — worth noting in light-industrial or HVAC-proximate installations.
• 120V AC Input with Internal 15V AC 2.2A Supply: The SA-25 runs on standard 120V AC, generating its own 15V AC at 2.2A internally. No external transformer or power supply required — one outlet, one controller. Factor the 2.2A draw into your circuit loading if multiple SA-25 units are installed on the same branch circuit.
• Compact 210mm × 159mm × 45mm Footprint: At roughly 8.3 × 6.3 × 1.8 inches, the SA-25 mounts in a telecom enclosure, network closet, or head-end cabinet without consuming significant real estate. The shallow 45mm depth fits behind most standard backboxes.
• Operating Range 0°C to 32°C (32°F to 90°F), 5%–95% Non-Condensing: The SA-25 is rated for conditioned indoor spaces — mechanical rooms, server closets, and above-ceiling IDF spaces that stay climate-controlled. It is not rated for unconditioned environments; if the head-end location has temperature swings below freezing or above 32°C, plan for an enclosure with thermal management or relocate the controller.

Integration and Compatibility

The SA-25 is the controller node in Viking's Viking Electronics self-amplified paging line. It pairs directly with the SA-1S two-wire self-amplified ceiling speaker and the SA-1H variant. For larger deployments that exceed 25 speakers or require zoned paging across multiple areas, the SA-X12 paging amplifier can be added to the signal chain — the SA-X12 accepts a 600Ω, 25V, 70V, 4Ω, 8Ω, or 16Ω audio feed and adds up to 12 additional SA-1S or SA-1H speakers per amplifier. This means a facility needing 37 speakers could deploy one SA-25 (25 speakers) plus one SA-X12 (12 speakers) off the same audio source. For integration into an existing commercial paging system, the Valcom/Bogen 24V four-wire compatibility allows the SA-25 to operate as a zone driver within a mixed-vendor infrastructure without a protocol converter. Consult the wire run chart on page 3 of the Viking installation manual for maximum cable distances by gauge — exceeding the recommended run length will introduce talk battery voltage drop and degrade intelligibility at the speaker end. For power planning and branch circuit sizing across a multi-zone deployment, see our paging system power planning guide. Browse compatible self-amplified ceiling speakers to complete the system build.

Frequently Asked Questions

Q: How many speakers can the SA-25 drive directly?

A: The SA-25 can directly drive up to 25 Viking self-amplified speakers — specifically the SA-1S two-wire ceiling speaker and the SA-1H variant — on a single controller without an additional amplifier.

Q: Does the SA-25 work with Valcom or Bogen paging systems?

A: Yes. The SA-25 supports both Viking's 40V two-wire output format and the Valcom/Bogen 24V four-wire format, allowing integration into existing Valcom or Bogen infrastructure.

Q: What audio input does the SA-25 accept?

A: The SA-25 has a 3.5mm (1/8-inch) audio jack for analog audio input, suitable for connecting a phone system paging port, intercom master station, or mic preamp.

Q: What is the operating temperature range of the SA-25?

A: The SA-25 is rated for 0°C to 32°C (32°F to 90°F) at 5% to 95% non-condensing humidity. It requires a conditioned indoor environment.

Q: What warranty does the SA-25 carry?

A: The SA-25 carries a two-year limited manufacturer warranty.

Q: Can I expand beyond 25 speakers with the SA-25?

A: Yes, by adding Viking SA-X12 paging amplifiers to the system. Each SA-X12 supports up to 12 additional SA-1S or SA-1H speakers and accepts standard audio inputs (600Ω, 25V, 70V, or 4/8/16Ω), allowing the overall system to scale well beyond the SA-25's 25-speaker limit.

Marty Allison

The SA-25 addresses a specific gap in small-to-mid-size paging deployments: you need overhead audio coverage across 15–25 zones but don't want to size and rack a traditional 70V amplifier plant. Viking's 40V two-wire talk battery architecture pushes amplification out to each SA-1S speaker, so the SA-25 controller just needs to deliver 30mA nominal on the loop — that's a manageable current budget on a standard two-conductor run, and it keeps the head-end cabinet lean.

Technical Highlights:

• 25-Speaker Direct Drive: The SA-25 handles up to 25 SA-1S or SA-1H speakers on a single controller — typical for a mid-size school wing, clinic floor, or light-industrial bay without needing a secondary amplifier stage.
• Dual Output Compatibility (40V / 24V): Supporting both Viking 40V two-wire and Valcom/Bogen 24V four-wire on the same controller means you're not locked into a single ecosystem — useful when inheriting a partial Valcom installation and migrating zones incrementally to Viking SA-1S speakers.
• Cage-Clamp Terminal Block (20 positions): Cage-clamp terminations hold wire under building vibration and repeated thermal cycling better than standard screw-capture blocks, which matters in mechanical rooms and above-ceiling spaces where the controller typically lives.

Deployment Considerations:

• Maximum wire run per speaker loop is gauge-dependent — consult the run chart on page 3 of the Viking installation manual before pulling cable. Under-gauged wire on long runs will drop the 40V DC talk battery below the threshold that each speaker's amplifier needs to operate cleanly.
• The SA-25 is rated only to 32°C (90°F). Unconditioned mechanical rooms or above-ceiling spaces in climates with summer peak temperatures above that threshold need either a ventilated enclosure or a cooler head-end location — this is the most common field complaint on self-amplified controllers in warm-weather regions.

For a K-12 school, outpatient clinic, or light-industrial facility running 10–25 overhead paging zones from a single IDF closet, the SA-25 delivers a clean, low-parts-count installation with room to scale via SA-X12 amplifiers if the zone count grows post-commissioning.